/**
 *    Copyright (C) 2013 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#pragma once

#include <string>

#include "mongo/db/commands.h"
#include "mongo/db/client_basic.h"
#include "mongo/s/write_ops/batched_command_request.h"

namespace mongo {

/**
 * Base class for write commands.  Write commands support batch writes and write concern,
 * and return per-item error information.  All write commands use the (non-virtual) entry
 * point WriteCmd::run().
 *
 * Command parsing is performed by the WriteBatch class (command syntax documented there),
 * and command execution is performed by the WriteBatchExecutor class.
 */
class WriteCmd : public Command {
    MONGO_DISALLOW_COPYING(WriteCmd);

public:
    virtual ~WriteCmd() {}

protected:
    /**
     * Instantiates a command that can be invoked by "name", which will be capable of issuing
     * write batches of type "writeType", and will require privilege "action" to run.
     */
    WriteCmd(StringData name, BatchedCommandRequest::BatchType writeType);

    // Full log of write command can be quite large.
    static void redactTooLongLog(mutablebson::Document* cmdObj, StringData fieldName);

private:
    virtual bool slaveOk() const;

    virtual bool isWriteCommandForConfigServer() const;

    virtual Status checkAuthForCommand(ClientBasic* client,
                                       const std::string& dbname,
                                       const BSONObj& cmdObj);

    virtual bool shouldAffectCommandCounter() const;

    // Write command entry point.
    virtual bool run(OperationContext* txn,
                     const std::string& dbname,
                     BSONObj& cmdObj,
                     int options,
                     std::string& errmsg,
                     BSONObjBuilder& result);

    // Write commands can be explained.
    virtual Status explain(OperationContext* txn,
                           const std::string& dbname,
                           const BSONObj& cmdObj,
                           ExplainCommon::Verbosity verbosity,
                           const rpc::ServerSelectionMetadata&,
                           BSONObjBuilder* out) const;

    // Type of batch (e.g. insert).
    BatchedCommandRequest::BatchType _writeType;
};

class CmdInsert : public WriteCmd {
    MONGO_DISALLOW_COPYING(CmdInsert);

public:
    CmdInsert();
    void redactForLogging(mutablebson::Document* cmdObj);

private:
    virtual void help(std::stringstream& help) const;
};

class CmdUpdate : public WriteCmd {
    MONGO_DISALLOW_COPYING(CmdUpdate);

public:
    CmdUpdate();
    void redactForLogging(mutablebson::Document* cmdObj);

private:
    virtual void help(std::stringstream& help) const;
};

class CmdDelete : public WriteCmd {
    MONGO_DISALLOW_COPYING(CmdDelete);

public:
    CmdDelete();
    void redactForLogging(mutablebson::Document* cmdObj);

private:
    virtual void help(std::stringstream& help) const;
};

}  // namespace mongo
